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Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | $ 12,521 | $ 12,567
Accumulated Amortization | 3,591 | 3,213
Net Book Value | 8,930 | 9,354
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 4,775 | 4,832
Accumulated Amortization | 1,187 | 1,020
Net Book Value | 3,588 | 3,812
Technology/Technical Know-how |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 3,578 | 3,634
Accumulated Amortization | 1,197 | 1,078
Net Book Value | 2,381 | 2,556
Tradenames |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 2,806 | 2,806
Accumulated Amortization | 609 | 533
Net Book Value | 2,197 | 2,273
Other |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 1,362 | 1,295
Accumulated Amortization | 598 | 582
Net Book Value | $ 764 | $ 713

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